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Pyronnet, Joseph. L'action non-violente: une nouvelle force de frappe; préf de Louis Rétif avec des textes de Lanza del Vasto et Martin Luther King ([Paris: Éditions Témoignage chrétien, 1965]). Thomas Merton's Marginalia Collection.
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Processionale cisterciense (Westmalle, Belgium: Ex typographia ordinis, 1926). Thomas Merton's Marginalia Collection. Personal copy used by Thomas Merton.
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Prager, Moshe. Rabbi Yisroel Baal-Shem-Tov (New York: Torah Umesorah Publications, 1966). Thomas Merton's Marginalia Collection. Inscribed to Merton by Paula Eliasoph. Contains minor marginalia by Merton.
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Prabhavananda, Swami. The spiritual heritage of India (Garden City, NY: Doubleday, 1964). Thomas Merton's Marginalia Collection.
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Pound, Ezra. Confucius: the great digest and Unwobbling pivot (New York: New Directions, 1951). Thomas Merton's Marginalia Collection.
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Porion, Jean-Baptiste. Amour et silence (Paris : Editions du Seuil, 1951). Thomas Merton's Marginalia Collection. Inscribed to Merton by Jean-Baptiste Porion.
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Polito, Julián Carlos. Estupor catatónico (B[uenos] Aires: Poesía-Ahora [1967]). Thomas Merton's Marginalia Collection.
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Politella, Joseph. Mysticism and the mystical consciousness illustrated from the great religions (Kent, Ohio: Kent State University, 1964). Thomas Merton's Marginalia Collection.
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Pieper, Josef, 1904-1997. In tune with the world: a theory of festivity (New York: Harcourt, Brace and World [1965]). Thomas Merton's Marginalia Collection.
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Phipps, John-Francis. Look forward in joy ([Derby, Eng.]: P. Smith, 1964). Thomas Merton's Marginalia Collection.